Chapter 4 Analog Input
X Series User Manual 4-16 ni.com
Figure 4-5. Differential Connections for Floating Signal Sources with
SingleBiasResistor
You can fully balance the signal path by connecting another resistor of
the same value between the positive input and AI GND, as shown in
Figure 4-6. This fully balanced configuration offers slightly better noise
rejection, but has the disadvantage of loading the source down with the
series combination (sum) of the two resistors. If, for example, the source
impedance is 2 kΩ and each of the two resistors is 100 kΩ, the resistors
load down the source with 200 kΩ and produce a –1% gain error.
–
+
R is about
100 times
source
impedance
of sensor
AI GND
R
V
s
Floating
Signal
Source
AI+
AI–
AI SENSE
MIO X Series Device
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
